Natural Weathering of Mineral Stabilized Asphalt Coatings on Organic FeltU.S. National Bureau of Standards, 1969 - 15 pages Sixteen years of outdoor weathering of laboratory-prepared smooth-surface and mineral-surfaced, felt-base roofing specimens has provided information on the effects of mineral additives on the durability of coating-grade roofing asphalts. Six finely divided mineral additives (blue black slate, clay, dolomite, fly ash, mica, and silica) were evaluated at concentrations up to 60 percent in California, Mid Continent and Venezuela asphalts. The mineral-surfaced specimens are all performing satisfactorily, and show only minor degrees of degradation. Of the smooth-surfaced specimens, the Mid-Continent asphalt performed the best and the California asphalt the poorest. The mica and blue black slate increased the durabilities of all three asphalts at all concentrations and two coating thicknesses. Fly ash, clay, dolomite, and silica were beneficial in some combinations, but had little effect in others. In general, these early results from outdoor exposure tend to corroborate the results obtained on these coatings exposed in weatherometers. (Author). |
From inside the book
Results 1-5 of 5
Page
... Measurement . ( In press . ) BSS21 . Algorithms for Psychometric Calculations . ( In press . ) BSS22 . Investigation of Performance Characteristics for Sanitary Plumbing Fixtures . ( In press . ) BSS23 . Hail Resistance of Roofing ...
... Measurement . ( In press . ) BSS21 . Algorithms for Psychometric Calculations . ( In press . ) BSS22 . Investigation of Performance Characteristics for Sanitary Plumbing Fixtures . ( In press . ) BSS23 . Hail Resistance of Roofing ...
Page 5
... measured . When the required number of acceptable panels had been prepared , the hot coating was ladled from the melting bath to the back - coater , which had pre- viously been heated to about 450 ° F ( 232 ° C ) . While one man rotated ...
... measured . When the required number of acceptable panels had been prepared , the hot coating was ladled from the melting bath to the back - coater , which had pre- viously been heated to about 450 ° F ( 232 ° C ) . While one man rotated ...
Page 6
... measured . In a normal run the felt panel was fastened with masking tape to the Kraft paper on the hot plate . About one and a half times the required coating was distributed over the panel . The motor was started and the panel was ...
... measured . In a normal run the felt panel was fastened with masking tape to the Kraft paper on the hot plate . About one and a half times the required coating was distributed over the panel . The motor was started and the panel was ...
Page 7
... measured prior to exposure . After about 12 years of exposure , cracks began to appear in the coatings . About a quarter of the specimens had cracks in 5 percent of their surface areas ( five grid areas ) after 12 and a half years . No ...
... measured prior to exposure . After about 12 years of exposure , cracks began to appear in the coatings . About a quarter of the specimens had cracks in 5 percent of their surface areas ( five grid areas ) after 12 and a half years . No ...
Page
... measurement ; coordinates that system with measurement systems of other nations ; and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community , industry , and com ...
... measurement ; coordinates that system with measurement systems of other nations ; and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community , industry , and com ...
Common terms and phrases
15 cents 60 percent silica aluminum-base specimens ARIB ASTM method automatic data processing back-coated Black Slate 25 blistering Blue Black Slate Building Science Series Bureau of Standards California asphalt Cement and Concrete Coating composition Thickness Coating thickness Composition Column 1 Column Composition Coating thickness Concrete Properties cracking and spalling doctor bar Dolomite 25 35 embedding rolls felt-base specimens Fly Ash 25 Fly Ash 50 granule-surfaced specimens Greenfeld increased the durability Institute for Applied Interrelations Between Cement Isopropyl alcohol Kraft paper Lake Erie Loss on ignition losses of granules Mica Mid-Continent asphalt mineral additives months of exposure Months Ratio Months National Bureau outdoor exposures performances Portland Cement Ratio Months Ratio saturated felt shingle smooth-surface specimens specimens after 15 specimens exposed outdoors Stabilized Asphalt Coatings straight asphalt surface specimens tabs thickness Composition Coating thickness mils mils three asphalts type of specimen U.S. Government Printing Venezuela asphalt Viscosity weatherometer tests